The Kurgan hypothesis famously states that the copper age culture that first spoke Proto-Indo-European lived very specifically within the internationally recognized borders of modern day Ukraine. They definitely did not migrate from the territory of any other modern-day country to the Pontic-Caspian steppe in a way that would cast doubt on the idea that Ukraine was the true birthplace of PIE. They also definitely did not live on both sides of Ukraine's arbitrary modern borders in a way that would cast doubt on the idea that Ukraine was the true birthplace of PIE. Archaeologists and linguists are also obviously all in complete consensual agreement about how the location of the Proto-Indo-European urheimat is a completely solved problem and thankfully no longer a point of contention that might never have a clear and easy answer.

Jeez, aren't we so lucky that human prehistory is so simple and lets me construct a nationalist narrative for a country that wouldn't even exist until like five millennia later?

[THIS ENTIRE COMMENT IS WRITTEN WITH SARCASTIC INTENT]